Fuel system

Abstract

A fuel system for use with viscous fuels comprising a housing defining a supply passage through which fuel can flow, in use, from a source of viscous fuel towards a fuel pump, and a throttle member located within the housing and arranged to control the rate of fuel flow along the supply passage. The throttle member is angularly adjustable within the housing to adjust the permitted fuel flow rate between the source and the pump.

We claim:  
     
       1. A fuel system for use with viscous fuels comprising a housing defining a supply passage through which fuel can flow, in use, from a source of viscous fuel towards a fuel pump, and a throttle member located within said housing, the throttle member being arranged such that its axis extends substantially along the axis of the supply passage, so as to control the rate of fuel flow along said supply passage, wherein said throttle member is angularly adjustable about its axis within said housing to adjust the permitted fuel flow rate. 
     
     
       2. The fuel system as claimed in claim  1 , wherein said throttle member is arranged to be driven by a rotary travel type solenoid arrangement. 
     
     
       3. The fuel system as claimed in claim  1 , further comprising a seal member located around said throttle member to form a substantially fluid tight seal between said throttle member and said housing. 
     
     
       4. The fuel system as claimed in claim  1 , wherein a part of said supply passage is defined by a bore provided in said housing, said throttle member being located within said bore. 
     
     
       5. The fuel system as claimed in claim  4 , wherein said throttle member is provided with a drilling which communicates with said source, said drilling being registrable with a further drilling provided in said housing to control the rate of flow of fuel along said supply passage. 
     
     
       6. The fuel system as claimed in claim  5 , wherein said throttle member is provided with a bore and a radially extending drilling, said radially extending drilling being registrable with said further drilling provided in said housing to control the rate of flow of fuel along said supply passage. 
     
     
       7. The fuel system as claimed in claim  6 , wherein said radially extending drilling provided in said throttle member is of non-circular cross-section. 
     
     
       8. The fuel system as claimed in claim  6 , wherein said further drilling provided in said housing is of non-circular cross-section. 
     
     
       9. A fuel system for use with viscous fuels comprising a housing defining a supply passage through which fuel can flow, in use, form a source of viscous fuel towards a fuel pump, and a throttle member located within said housing, wherein said throttle member is angularly adjustable within said housing to adjust the permitted fuel flow rate, a part of said supply passage being defined by a bore provided in said housing, wherein said throttle member is located within said bore and is provided with a drilling which communicates with said source, said drilling being registerable with a further drilling provided in said housing to control the rate of flow of fuel along said supply passage. 
     
     
       10. The fuel system as claimed in claim  9 , wherein said throttle member is provided with a bore and a radially extending drilling, said radially extending drilling being registerable with said further drilling provided in said housing to control the rate of flow of fuel along said supply passage. 
     
     
       11. The fuel system as claimed in claim  10 , wherein said radially extending drilling provided in said throttle member is of non-circular cross-section. 
     
     
       12. The fuel system as claimed in claim  10 , wherein said further drilling provided in said housing is of non-circular cross-section. 
     
     
       13. The fuel system as claimed in claim  11 , wherein said further drilling provided in said housing is of non-circular cross-section. 
     
     
       14. The fuel system as claimed in claim  9 , wherein said throttle member is arranged to be driven by a rotary travel-type solenoid arrangement. 
     
     
       15. The fuel system as claimed in claim  9 , further comprising a seal member located around said throttle member to form a substantially fluid tight seal between said throttle member and said housing.